US11333186B2 - Dowel pin for easy assembly and high accuracy - Google Patents

Dowel pin for easy assembly and high accuracy Download PDF

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US11333186B2
US11333186B2 US17/440,481 US202017440481A US11333186B2 US 11333186 B2 US11333186 B2 US 11333186B2 US 202017440481 A US202017440481 A US 202017440481A US 11333186 B2 US11333186 B2 US 11333186B2
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dowel pin
contact areas
pin
radially
distance
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US20220090617A1 (en
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Janus Juul Rasmussen
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Component 20 AS
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Component 20 AS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
    • F16B13/126—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like fastened by inserting an unthreaded element, e.g. pin or nail
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
    • F16B19/002—Resiliently deformable pins
    • F16B19/004—Resiliently deformable pins made in one piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
    • F16B19/02—Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/06—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips
    • F16B5/0607—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other
    • F16B5/0621—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship
    • F16B5/0642—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship the plates being arranged one on top of the other and in full close contact with each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like

Definitions

  • the disclosure relates to a cylindrical pin, such as e.g. a dowel pin or parallel pin for connecting and/or guiding components, particularly in tooling, fixture and machine construction, which has a cylindrical circumferential surface.
  • a cylindrical pin such as e.g. a dowel pin or parallel pin for connecting and/or guiding components, particularly in tooling, fixture and machine construction, which has a cylindrical circumferential surface.
  • Such cylindrical pins are above all used for arresting or pinning plates, individual elements, or tool portions for cutting, stamping, or shaping tools.
  • the dimensions of the cylindrical pins are regulated by standards, particularly DIN 6325 or ISO 8734.
  • Dowel pins are typically used to secure correct accurate and precise positioning of a part or component in three directions relative to a substrate.
  • mechanical engineers typically use dowel holes as reference points to control positioning variations and attain repeatable assembly quality.
  • dowel pins there are a variety of specifications, military, ISO, DIN, ASME that dowel pins may be made to.
  • DIN 6325 standard the dowel pins are slightly larger than the nominal value.
  • a 3 mm dowel pin will range from 3.002 to 3.008.
  • the dowel pins are slightly smaller—3 mm nominal range is 2.986 to 3.000.
  • the terminology e.g. “oversized”, “standard”) is not entirely consistent across suppliers.
  • Both dowel pins and the holes for the dowel pins are machined (reamed) with a tight tolerance.
  • the fit between the hole and the pin can be a press fit, i.e. the hole has a slightly smaller diameter than the dowel, said during assembly the dowel pin must be pressed with force into the hole.
  • the fit can be a slip fit, i.e. the whole has a layer matter slightly larger than the dowel pin. The dowel pin slips into the hole and slides out easily.
  • Precision location can be very important in various engineering applications, such as e.g. machining and assembly.
  • machining the tool follows a very precise path and a workpiece must be located precisely and stably at a precise position.
  • assembly the positions of assembled parts must be assembled easily and overconstraint of the parts must be avoided.
  • a pair of two dowel pins is used to locate the component on the substrate.
  • U.S. Pat. No. 4,553,334 discloses a universal dowel pin system 10 for properly aligning any one of a plurality of workpiece fixtures 12 relative to a machine tool table 14 comprises a dowel pin 20 which has a square-shaped base section 22 adapted to be dimensionally customized so that the width dimension thereof is substantially the same as the width dimension of the space defined between the sidewalls 18 of the machine tool table T-slot 16 , while the upper pin section 24 of the dowel pin 20 has a diametrical dimension which is substantially the same as the uniform or standardized diametrical dimension of a bore 30 which may be defined within an insert 28 or directly defined within the particular workpiece fixture 12 .
  • the machine tool table 14 may be universally utilized in connection with a plurality of different workpiece fixtures 12 .
  • the bottom sections 22 of the dowel pins 20 will all have customized dimensions to match those of the particular machine tool table T-slots 16 , but all upper sections 24 of all the dowel pins 20 will have the same dimension whereby a plurality of machine tool tables 14 will individually universally mate with a plurality of different workpiece fixtures 12 (all reference numerals a numerals used above relates to the reference numerals of U.S. Pat. No. 4,553,334).
  • U.S. Pat. No. 4,553,334 discloses a dowel pin having an elongated body divided in a first part and a second part.
  • the first part is cylindrical with a circumferential surface.
  • the second part is square-shaped.
  • the second square-shaped part has a cylindrical pin section integrally formed therewith.
  • the cylindrical pin section is received in a counterbore in the cylindrical part, and thus the first part can move relative to the second part in a longitudinal direction of the dowel pin, but not in a transverse direction.
  • EP1548297A1 discloses a dowel pin for being received in a hole for at least one of connecting and guiding tool, fixture, or machine components comprising a cylindrical circumferential surface, a first longitudinal end, and a second longitudinal end, the circumferential surface comprising a first plurality of primary radially lifted contact areas substantially evenly distributed around the circumference of the cylindrical pin at a first distance D 1 from the first longitudinal end and at a second distance D 2 from the second longitudinal end, the first distance D 1 being smaller than the second distance D 2 .
  • a dowel pin for use in a pair of dowel pins for positioning a component on a substrate, said dowel pin comprising an elongated substantially cylindrical body with a circumferential surface, said substantially cylindrical body being divided into a first part and a second part with said circumferential surface ( 5 ) being divided into a first portion on said first part and a second portion on said second part said first part being movably connected to said second part allowing only relative transverse movement between said first part and said second part.
  • the inventor arrived at the insight that a substantial portion of the problems relating to assembly are caused by the fixed distance between the pair of dowel pins and the fixed distance between the holes in the component.
  • the conventional dowel pin will remove two translational degrees of freedom, whilst the flexible dowel pin according to the first aspect removes the final rotation degree of freedom.
  • Two dowel pins are needed to lock two transitional movements and one rotational movement: one flexible dowel pin according to the first test with one degree of freedom and one conventional flex pin with zero degrees of freedom.
  • the traverse movement is limited in extent by a mechanical stop.
  • overload protection is provided.
  • first portion and said second portion making up the complete circumferential surface.
  • the transverse movement away from a position wherein the first part and the second part are aligned is against the bias of a resilient element.
  • the first part is movably connected to the second part allowing relative movement between the first part and the second part only in one predetermined transverse direction A.
  • a flexible dowel pin is provided that is only 1 degree of freedom.
  • the relative movement is limited to movement in one transverse direction by interacting guide surfaces on the first part and the second part.
  • the relative movement between the first part and the second part is resiliently biased, preferably resiliently biased to a position where the first part and the second part are aligned.
  • first portion of the longitudinal extent of the outer surface and the second portion of the longitudinal extent of the outer surface of the substantially cylindrical body together substantially form the complete longitudinal extent of the dowel pin.
  • the first portion is flush with the second portion when the first part and the second part are aligned.
  • the dowel pin has a substantially completely flush cylindrical circumferential outer surface when the first part and the second part are aligned and can be used like any conventional dowel pin.
  • the shape and size of the outer surface of the dowel pin are, at least when the first part and the second part are aligned, in accordance with the requirements for the shape and size required for the outer surface by DIN and/or ISO standards for dowel pins, preferably in accordance with DIN 6325 and/or ISO 2338.
  • the first part has a hollow interior opening towards the second part, and the second part ( 3 ) comprises a connecting member that projects into the hollow interior.
  • a free end of the connecting member is secured to a closed end of the hollow interior.
  • the connecting member biases the second part resiliently towards a position where the second part is aligned with the first part.
  • the first guide element comprises two parallel and transversely extending primary guide surfaces, the primary guide surfaces preferably being arranged diametrically opposite relative to a longitudinal axis of the dowel pin.
  • the second guide element comprises two secondary guide surfaces, the secondary guide surfaces preferably being arranged diametrically opposite relative to a longitudinal axis of the dowel pin.
  • the primary guide surfaces are formed by the cross-sectional outline of the hollow interior, preferably the cross-sectional outline of the hollow interior at or near the open-ended end of the hollow interior.
  • the cross-sectional outline of the hollow interior at or near the open-ended end of the hollow interior is oblong.
  • the cross-sectional outline of the connecting member at or near the longitudinal end of the connecting member closest to the second part is oblong.
  • the relative movement in the one predetermined transverse direction is limited by a mechanical stop. This ensures the presence of overload protection.
  • the mechanical stop is provided by the cross-sectional outline of the hollow interior at or near the second member limiting the relative movement of the cross-sectional outline of the connecting member.
  • the cross-sectional outline of a portion of second member that projects into the hollow interior is configured to fit into the cross-sectional outline of the hollow interior at or near the open-ended end of the hollow interior to allow for the relative movement in the one transverse direction and to prevent relative movement in any other transverse direction.
  • the first part is configured to be at least partially received in a matching bore in the substrate and wherein the second part is configured to be at least partially received in a matching bore in the object.
  • a pair of dowel pins comprising one dowel pin according to the first aspect or any possible implementations thereof, and one conventional dowel pin, the conventional dowel pin preferably being a dowel pin in accordance with iso 287 DIN 2768.
  • a dowel pin for being received in a hole for at least one of connecting and guiding tool, fixture, or machine components, the dowel pin comprising a cylindrical circumferential surface, a first longitudinal end, and a second longitudinal end, the circumferential surface comprising a first plurality of primary radially lifted contact areas substantially evenly distributed around the circumference of the cylindrical pin at a first distance D 1 from the first longitudinal end and a second distance D 2 from the second longitudinal end, the first distance D 1 being smaller than the second distance D 2 , and a second plurality of secondary lifted contact areas substantially evenly distributed around the circumference of the cylindrical pin at a third distance D 3 from the first longitudinal end and a fourth distance D 4 from the second longitudinal end, the third distance D 3 being larger than the fourth distance D 4 .
  • the inventor arrived at the insight that a substantial portion of the problems relating to assembly are caused by the hole in which the dowel pin is to be received is not perfectly circular, and thus not suitable for receiving a perfectly circular dowel pin.
  • the reduced diameter circumferential service provides for the clearance with innermost parts (apex) of the noncircular hole whilst the elevated contact areas engage the inner side of the hall and provide an effective diameter that corresponds to the norm diameter of the dowel pin.
  • the first distance D 1 is determined from the middle of the primary radially lifted contact areas in the axial direction.
  • the second distance D 2 is determined from the middle of the primary radially lifted contact areas in the axial direction.
  • the third distance D 3 is determined from the middle of the secondary radially lifted contact areas in the axial direction.
  • the fourth distance D 4 is determined from the middle of the secondary radially lifted contact areas in the axial direction.
  • the second plurality of secondary lifted surfaces is radially lifted to the same extent as the first plurality of primary lifted surfaces.
  • the radially lifted contact areas have a substantially rectangular outline.
  • the transition between the radially lifted contact areas and the remainder of the substantially cylindrical circumferential surface is a smooth transition, the transition preferably comprising a chamfer.
  • the primary radially lifted contact areas and the secondary radially lifted contact areas are radially slightly lifted above the substantially cylindrical circumferential surface of the dowel pin surrounding the primary radially lifted contact areas and the secondary radially lifted contact areas.
  • the primary radially lifted contact surfaces and the secondary radially lifted contact surfaces are lifted to an extent that ensures that deviation of the hole from nominal geometry does not cause contact with the circumferential surface that is not formed by the primary radially lifted contact surfaces and the secondary radially lifted contact surfaces.
  • the portion of the substantially cylindrical circumferential surface formed by the primary radially lifted contact areas and by the secondary radially lifted contact areas is compatible with DIN 6325 and/or ISO 2339.
  • the outer surface of the cylindrical pin neither formed by the primary radially lifted contact areas nor by the second radially lifted contact areas is radially slightly receded relative to the primary radially lifted contact areas and the secondary radially lifted contact areas, and preferably also slightly receded relative to the outer diameter required to be compatible with DIN 6325 and/or ISO 2339.
  • first longitudinal end and/or the second longitudinal end comprise a longitudinally tapered portion.
  • the radially outward surface of the primary radially lifted contact areas and of the secondary radially lifted contact areas is straight in the direction of the axis of the dowel pin and is curved in a circumferential direction.
  • radially lifted contact areas and of the secondary radially lifted contact areas are curved with a radius extending from the axis of the cylindrical pin to the radially outward surface.
  • the primary and secondary lifted surfaces form the contact surfaces with a matching hole in which dowel pin is to be inserted.
  • FIG. 1 exploded elevated view of a dowel pin according to an embodiment
  • FIG. 2 is a top view of the dowel pin of FIG. 1 ,
  • FIG. 3 is a cross-sectional view of the dowel pin of FIG. 4 in a plane coinciding with the longitudinal axis of the dial pin,
  • FIG. 4 is a cross-sectional view of the dowel pin of FIG. 1 in a plane that is traverse at a right angle to the longitudinal axis of the dial pin,
  • FIGS. 5 and 6 are enlarged details of FIG. 4
  • FIG. 7 is a side view of the dowel pin of FIG. 1 .
  • FIGS. 8 to 10 are cross-sectional views through the dowel pin as shown in FIG. 7
  • FIG. 11 is a cross-sectional view of the dowel pin as shown in FIG. 7 in a plane coinciding with the longitudinal axis of the dial pin,
  • FIGS. 12 and 13 are enlarged details of FIG. 11 .
  • FIG. 14 is an elevated view of the dowel pin of FIG. 1 in gray scale format
  • FIG. 15 exploded elevated view of a dowel pin according to another embodiment
  • FIG. 16 is a side view of the dowel pin of FIG. 15
  • FIG. 17 is an elevated view of a component positioned and secured to a substrate by a dowel pin according to an embodiment and a conventional dowel pin,
  • FIG. 18 is a cutaway version of FIG. 17 .
  • FIG. 19 a top view on the component positioned and secured to a substrate by a dowel pin according to an embodiment and a conventional dowel pin as shown in FIG. 17 ,
  • FIG. 20 is side view a dowel pin according to another embodiment.
  • FIG. 21 is a sectional view of another embodiment of the dowel pin.
  • a dowel pin 1 (also called parallel pin or guide pin) is shown with a cylindrical body 4 that is formed by a first part 2 connected to a second part 3 .
  • the cylindrical body 4 is divided into the first part 2 and the second part 3 .
  • the dowel pin 1 is intended to be used in a way identical or at least similar to the way that conventional dowel pins are used.
  • the circumferential surface 5 of the cylindrical body 4 is manufactured to comply with the standards for dowel pins, such as e.g. DIN 6325 or ISO 2338.
  • the first part 2 forms a first portion 6 a of the (cylindrical) circumferential surface 5 of the dowel pin 1 .
  • the second part forms a second portion 6 B of the (cylindrical) circumferential surface five the dowel pin 1 .
  • the first portion 6 A and the second portion 6 B together form the complete circumferential surface of the dowel pin 1 .
  • the second part 3 is connected to the first part 2 in a way that allows relative movement of the second part 3 relative to the first part 2 in transverse directions, i.e. in directions perpendicular to the longitudinal extent of the dowel pin 1 .
  • the extent of the transverse movement is mechanically limited and, in an embodiment, resiliently biased towards the center position in which the first portion 6 A and the second portion 6 B are completely aligned, preferably aligned to form one substantially flush circumferential surface 5 of the dowel pin 1 . It is however understood that it is perfectly acceptable to have a gap between the first portion 6 A and the second portion 6 B.
  • first portion 6 A is the same as the diameter of the second portion 6 B, but it is understood that the first portion 6 A and the second portion 6 B can have different diameters, with for example the second portion 6 A having a smaller or a larger diameter than the first portion 6 B.
  • the second part 3 is connected to the first part 2 by a connecting member 8 .
  • the connecting member 8 is formed by a rod that is an integral part of the second part 3 . It is however understood that the connecting member 8 does not have to be integral with the second part 3 and could be connected at its proximal end to the second part 3 .
  • the first member 2 is provided with a hollow interior 7 that opens to longitudinal the end of the first member 2 that faces the second member 3 .
  • the connecting member 8 extends into the hollow interior 7 of the first member 2 .
  • the distal end of the connecting member 8 is rigidly secured to the first member 2 at or near the first longitudinal end 27 of the first member 2 opposite to the longitudinal end to which the hollow interior 7 opens.
  • the distal end of the connecting member 8 is in an embodiment provided with, or connected to, a cylindrical base 28 that is secured in a matching cylindrical bore in the first member 2 .
  • the cylindrical base 28 is an embodiment provided with a flange 29 to ensure that the cylindrical base 28 is inserted into the bore to the correct depth.
  • the bore in which the cylindrical base 28 is received opens to the longitudinal end of 27 the first member 2 and the tip of the cylindrical base 28 forms the end surface of the first member 2 .
  • the first longitudinal end 27 is provided with a convex surface, preferably a convex surface that is compatible with standards for dowel pins, such as e.g. the above-referenced standards.
  • the second longitudinal end 26 of the second part 2 is provided with a convex surface, preferably a convex surface that is compatible with the standards for dowel pins, such as e.g. the above-referenced standards.
  • connection member 8 is arranged such that the second member has its circumferential surface 6 B aligned with the circumferential surface 6 A of the first member 2 when there is no transverse load on urging the second member 3 transversely to the first member 2 .
  • the relatively slim connecting member 8 allows for transverse movement of the second member 3 relative to the first member 2 when a transverse load or force is applied to the second member 3 .
  • the extent of this transverse movement is restricted by a mechanical stop.
  • the mechanical stop is formed by mechanical interaction between one or more guide surfaces associated with the second part 3 and one or more guide surfaces associated with the first part 2 .
  • the surface associated with the second part 3 is formed by a disk-shaped number 15 connected to or integral with the second member 3 , which is received in the opening of the hollow interior 7 .
  • the inner surface of the opening forms the guide surface associated with the first member 2 and the circumferential surface 16 of the disc-shaped number 15 forms the guide surface associated with the second part 3 .
  • the inner surface of the opening comprises two planar guide surfaces 12 , 13 .
  • the guide services 12 , 13 are diametrically spaced apart at a distance that corresponds exactly to the diameter of the disc-shaped member 15 .
  • the second part 3 is guided in one linear transverse direction and can only move in one transverse direction relative to the first part 2 (one direction of freedom).
  • the one transverse direction is illustrated by the arrows A and A′ in FIG. 2
  • the opening is in this embodiment an oblong shape that allows only transverse relative movement of the second part 3 relative to the first part 2 .
  • the disc-shaped member is provided with diametrically opposite planar guide surfaces that interact with the planar guide surfaces 12 , 13 of the opening in order to avoid line contact and thereby obtain lower contact pressures.
  • the arrangement for ensuring that the second part 3 moves only in one transverse direction relative to the first part 2 may comprise other types of guide surfaces, such as e.g. rods, bars grooves or bores or combinations thereof.
  • the dowel pin 1 is configured such that it allows a substantially equal extent of movement in all transverse directions (two directions of freedom) e.g. by having a circular shape for the opening with a disk-shaped member 15 received therein with a slightly smaller diameter than the opening.
  • the disc-shaped number 15 is in the present embodiment integral with the second part 3 , but it is understood that that disk-shaped number 15 could be connected to the second part 3 by various connection means such as e.g. bolting, adhesive or welding.
  • the second longitudinal end 26 of the second part 3 is provided with an arrow and 30 indicating the direction in which transverse movement of the second part 3 relative to the first part 2 is possible.
  • This arrow 30 provides visual help for manual or robot installation of the dowel pin 1 with the correct mechanical orientation when mounting the dowel pin 1 in a hole in e.g. a substrate.
  • the hero can be provided by engraving, by milling, by printing or by other suitable means.
  • the first part 2 is provided with tapering section 24 (conical frustum) towards the first longitudinal end 27 and the second part 2 is provided with a tapering section 25 (conical frustum) towards the second longitudinal and 26 , in order to facilitate inserting the dowel pin 1 in a hole.
  • connection member 8 in the present embodiment is relatively thin in order to allow the collection member 8 to flex (elastically bend) and thereby to allow relative transverse movement of the second part 3 relative to the first part 2 .
  • FIGS. 11 to 13 illustrate another aspect of the valve pin 1 according to the present embodiment, namely a number of radially lifted surfaces 31 , 33 , 35 .
  • FIG. 11 is a sectional view along the length of the dowel pin 1
  • FIGS. 12 and 13 are two enlarged sections of FIG. 11 illustrating details of the radially lifted contact areas.
  • a first plurality of primary radially lifted contact areas 33 is circumferential substantially evenly distributed around the circumference of the cylindrical pin 1 on the first part 2 at a first axial distance D 1 from the first longitudinal end and at an axial second distance D 2 from the second longitudinal end of the first part 2 .
  • the axial first distance D 1 is smaller than the second axial distance D 2 .
  • the first distance D 1 is determined from the middle of the primary radially lifted contact areas 33 in the axial direction
  • the second distance D 2 is determined from the middle of the primary radially lifted contact areas 33 in the axial direction.
  • a second plurality of secondary radially lifted contact areas 35 is circumferential substantially evenly distributed around the circumference of the dowel pin 1 on the first member 2 at a third axial distance D 3 from said first longitudinal end and a fourth axial distance D 4 from the second longitudinal end, the third distance D 3 being larger than the fourth distance D 4 .
  • the third distance D 3 is determined from the middle of the secondary radially lifted contact areas 35 in the axial direction and the fourth distance D 4 is determined from the middle of the secondary radially lifted contact areas 35 in the axial direction.
  • the second plurality of secondary lifted surfaces 35 is radially lifted to the same extent as the first plurality of primary radially lifted surfaces 33 .
  • a third plurality of tertiary radially lifted contact areas 31 is substantially circumferentially evenly distributed around the circumferential surface of the dowel pin 1 on the second member 3 at a fifth axial distance D 5 from the second longitudinal end of the dowel pin 1 .
  • the third plurality of tertiary lifted surfaces 31 is radially lifted to the same extent as the first plurality of primary radially lifted surfaces 33 .
  • the radially lifted contact areas 31 , 33 , 35 have a substantially rectangular outline.
  • the radially lifted contact areas 31 , 33 , 35 can have any other suitable outline, such as e.g. a circular, oval, triangular, or polygon outline.
  • the transition between the radially lifted contact areas 31 , 33 , 35 and the remainder of the substantially cylindrical circumferential surface of the pin 1 in an embodiment a smooth transition.
  • this transition is a curved transition or is a transition that comprises a chamfer.
  • any type of smooth transition between the cylindrical circumferential surface of the dowel pin 1 and the radially lifted contact areas 31 , 33 , 35 can be used.
  • the plurality of primary radially lifted contact areas 33 comprises four primary contact areas that are circumferentially evenly distributed around the first part 2 .
  • the same number of secondary and tertiary radially lifted contact areas 35 , 31 is used.
  • the primary radially lifted contact areas 33 are in an embodiment rotationally aligned with the secondary radially lifted contact areas 35 and in an embodiment, the tertiary radially lifted contact areas 31 are rotationally aligned with the primary radially lifted contact areas 33 .
  • the plurality of primary radially lifted contact areas 33 is arranged at an axial distance D 1 from the first longitudinal end 27 of the dowel pin 1 formed by the first part 2 , such that there is a “free-running” (clearance fit) distance DC, the length of which is proportional to the diameter of the dowel pin 1 .
  • the dowel pin 1 is inserted with its first part 2 into a designated hole before the second part 3 is inserted into another designated hole of another object.
  • the free-running extent of the length of the first part 2 secures that an operator can correctly rotationally align the dowel pin 1 with its one direction of radial movement in the direction of arrow 30 before the radially lifted contact areas are loaded and rendered rotation of the dowel pin 1 difficult or impossible. This secures correct mounting with no risk of scratching the sides, thereby maximizing precision and reducing mounting force variation.
  • the free-running (clearance fit) distance DC is N times the diameter of the dowel pin 1 .
  • the primary radially lifted contact areas 33 and the secondary radially lifted contact areas 35 , 36 are radially slightly lifted above the substantially cylindrical surface 5 of the cylindrical pin 1 surrounding the primary radially lifted contact areas 33 the secondary radially lifted contact areas 35 and the tertiary radially lifted contact areas 31 .
  • the circumferential surface 5 of the cylindrical pin 1 not formed by radially lifted contact areas is radially slightly receded relative to the radially lifted contact areas 31 , 33 , 35 .
  • the circumferential surface 5 of the cylindrical pin 1 not formed by radially lifted contact areas 31 , 33 , 35 is radially slightly receded relative outer diameter required to be compatible with various standards, e.g. DIN 6325 and/or ISO 2339.
  • the radially lifted contact areas 31 , 33 , 35 are radially lifted by relative to the remainder of the circumferential surface of the dowel pin 1 by an amount sufficient to ensure that any deviation of the hole in which the dowel pin 1 is to be inserted from nominal geometry does not cause contact between the hole wall and the remainder of the circumferential surface 5 of the dowel pin 1 .
  • the allowed deviation from nominal geometry of a hole for receiving a dowel pin 1 is defined by standards for tolerances such as e.g. ISO 287 or DIN 2768.
  • the minimum amount of lift for the radially lifted contact areas 31 , 33 , 35 in order to avoid contact of the remaining circumferential surface of the dowel pin 1 with the hole wall is increased by a security margin or even multiplied by a factor to ensure that no contact will take place between the remaining circumferential surface of the dowel pin 1 and the hole wall.
  • the radially lifted contact surfaces 31 , 33 , 35 form the contact surfaces with a matching hole in which the dowel pin 1 is to be inserted.
  • the contact surface is formed by the radially lifted contact areas 31 , 33 , 35 that are compatible with DIN 6325 and/or ISO 2339, i.e. the radially lifted contact areas 31 , 33 , 35 form contact surfaces that are in the same position as the cylindrical circumferential surface 5 of a conventional dowel pin 100 with the same diameter, whilst the receded area of the circumferential surface 5 of the dowel pin 1 is receded compared to a conventional dowel pin 100 with the same diameter.
  • first longitudinal end 27 of the dowel pin 1 on the first part 2 and the second longitudinal end 26 of the dowel pin 1 on the second part 3 comprises a longitudinally tapered portion, preferably in a fashion that forms a surface corresponding to a conical frustum.
  • surface of the primary, secondary and tertiary radially lifted contact areas 31 , 33 , 35 is straight in the direction of the axis of the dowel pin 1 and is curved in a circumferential direction relative to the axis of the dowel pin 1 .
  • the primary, secondary and tertiary radially lifted contact areas 33 , 35 , 31 are curved with a radius that matches the radius of a conventional dowel pin 100 with the same intended diameter.
  • FIG. 14 is an elevated grayscale view that illustrates a dowel pin 1 according to the above embodiment with its lifted surfaces 31 , 33 , 35 .
  • FIGS. 15 and 16 illustrate another embodiment of the dowel pin 1 .
  • structures and features that are the same or similar to corresponding structures and features previously described or shown herein are denoted by the same reference numeral as previously used for simplicity.
  • the dowel pin 1 of FIGS. 15 and 16 is essentially identical to the dowel pin 1 described with reference to FIGS. 1 to 14 , except that the dowel pin 1 has a circumferential surface that is not provided with any lifted surfaces, and generally corresponds to the shape of a circular cylinder.
  • FIGS. 17 to 19 illustrates the use of the valve pin 1 according to the various embodiments in combination with a conventional dowel pin 100 to form a pair of dowel pins.
  • a substrate 22 such as e.g. a base or carrier of a machine is provided with a first and third precisely machined hole 23 .
  • a dowel pin 1 according to an embodiment is shown with its first part 2 inserted into the first bore (hole) 23 in the substrate 22 and with its second part 3 inserted into a second hole 21 of a component 20 .
  • Another dowel pin 100 of a conventional type is inserted with one end into a third bore 23 in the substrate 22 and with another end into a fourth bore 21 of the component 20 .
  • the substrate 22 such as e.g. a base for carrier of a machine is provided with the first and second precisely machined bores 23 spaced apart by a distance DS 1 between their respective centers, as measured along a center line L that runs through the respective centers of the first bore 23 and the third bore 23 .
  • the diameter of the first bore 23 and the third bore 23 are identical, but it is understood that the diameter is of these two bores can be different from one another.
  • the component 20 such as e.g. an object or blank that needs to be machined by the machine of the substrate 22 is also provided with a first and second precisely machined bore 21 that are spaced apart by a distance DS 2 , which should be exactly the same as the distance DS 1 .
  • the movability of the second part 3 relative to the first part 2 of the dowel pin 1 in the direction along the centerline L allows for compensation of the slight deviation between the distances DS 1 and DS 2 , thereby allowing easy and smooth mounting (and subsequent removal) of the component 20 on the substrate 22 using accurate fit between the dial pin 1 , conventional dial pin 100 and the holes 21 , 23 in which they are received.
  • the conventional dial pin 100 and the dowel pin 1 together form a pair of dowel pins that accurately position the component 20 relative to the substrate 23 , whilst simultaneously ensuring easy mounting and subsequent removal of the component 20 .
  • the conventional pin 100 removes two translational degrees of freedom, while the dowel pin 1 removes the final rotational degree of freedom.
  • the dowel pin 1 needs to be inserted into the hole 23 with the correct rotational orientation, such that the only one direction of transverse movement as indicated by arrow 30 is parallel with a centerline L connecting the center of the first hole 23 with second hole 23 .
  • movement of the second part 3 of the dowel pin 1 in the direction of the centerline compensates for any deviance between the distance DS 1 and the distance DS 2 , while simultaneously ensuring that the component 20 is as accurately position relative to the substrate 23 as when using two conventional dowel pins 100 with an accurate or tight fit.
  • FIG. 20 discloses another embodiment that is similar to the previously described embodiments, except that the dowel pin 1 is a single-piece construction.
  • structures and features that are the same or similar to corresponding structures and features previously described or shown herein are denoted by the same reference numeral as previously used for simplicity.
  • cylinder and cylindrical in this disclose refer in embodiments to a circular cylinder.
  • a dowel pin 1 with transverse movability of the second part relative to the first part with the local dowel been having a cylindrical circumferential surface that is different from a circular cylinder and instead is formed by other types of cylindrical surfaces, such as e.g. elliptic cylinders.
  • the dowel pin 1 according to the embodiments above can be made from any suitable material, such as metals, ceramics, composites and/or plastics.
  • the dowel pin 1 can be manufactured by machining, forming, grinding and/or additive manufacturing.
  • the dowel pins 1 and effected accordingly can be surface treated by conductive surface treatment, hardening, polishing, corrosion protection and/or friction decreasing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
US17/440,481 2019-03-27 2020-03-12 Dowel pin for easy assembly and high accuracy Active US11333186B2 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DKPA201970188 2019-03-27
DKPA201970187 2019-03-27
DKPA201970188 2019-03-27
DKPA201970187 2019-03-27
PCT/DK2020/050061 WO2020192853A1 (fr) 2019-03-27 2020-03-12 Vis d'arrêt pour un montage facile et une haute précision

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US20220090617A1 US20220090617A1 (en) 2022-03-24
US11333186B2 true US11333186B2 (en) 2022-05-17

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EP (1) EP3947986A4 (fr)
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US2100873A (en) * 1935-12-28 1937-11-30 Russell M Roberts Dowel structure
US3461772A (en) * 1967-05-02 1969-08-19 Southco Barbed plastic rivet
US3550244A (en) * 1967-07-11 1970-12-29 Standard Pressed Steel Co Method of making coded dowel pins
GB1237714A (en) 1967-12-13 1971-06-30 Dayton Progress Corp Multiple function pin
US3606410A (en) 1969-05-05 1971-09-20 Anthony J Inserra Push in and pull out line up dowel
US4553334A (en) 1984-02-03 1985-11-19 Westinghouse Electric Corp. Universal dowel pin system
US4647883A (en) * 1983-08-27 1987-03-03 Oxley Robert Frederick Tuning screw having a resilient plastics bush which supports the tuning plunger within a metal bush
DE4231339A1 (de) 1992-09-18 1994-03-24 Hans Kuehl Vorrichtung zum Paßzentrieren und zum Paßverbinden
EP0662200A1 (fr) 1992-09-18 1995-07-12 Hans Kuehl Dispositif pour relier au moins deux elements.
US5568675A (en) * 1994-03-29 1996-10-29 Nifco Inc. Two-piece clip
NZ244817A (en) 1992-10-20 1997-11-24 Lesa Systems Ltd Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement
US6345946B1 (en) * 2000-08-03 2002-02-12 Radio Systems Corporation Fastener
US20040020016A1 (en) * 2002-06-12 2004-02-05 Piolax, Inc. Two-piece clip
EP1529966A1 (fr) 2003-11-07 2005-05-11 Modular Systems, Inc. Cheville de fixation et joints comprenants celle-ci
EP1548297A1 (fr) 2003-12-23 2005-06-29 Spirol International Corporation Goupille avec rainures de forme spirale
US20060088396A1 (en) * 2004-10-21 2006-04-27 Thom Ray A ADA compliant element
ES2273210T3 (es) 2003-02-07 2007-05-01 Friatec Aktiengesellschaft Elemento de recepcion.
US20090274533A1 (en) * 2006-10-19 2009-11-05 Gunther Zimmer Cover plate anchor with cover plate engagement structure
US7794273B2 (en) * 2007-11-16 2010-09-14 Hon Hai Precision Ind. Co., Ltd. Cable connector assembly with improved fastening device
CN202348887U (zh) 2011-11-21 2012-07-25 刘美福 一种多功能定位销
US20180156255A1 (en) * 2015-01-26 2018-06-07 Good Earth Lighting, Inc. Anchor fastener
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US2100873A (en) * 1935-12-28 1937-11-30 Russell M Roberts Dowel structure
US3461772A (en) * 1967-05-02 1969-08-19 Southco Barbed plastic rivet
US3550244A (en) * 1967-07-11 1970-12-29 Standard Pressed Steel Co Method of making coded dowel pins
GB1237714A (en) 1967-12-13 1971-06-30 Dayton Progress Corp Multiple function pin
US3606410A (en) 1969-05-05 1971-09-20 Anthony J Inserra Push in and pull out line up dowel
US4647883A (en) * 1983-08-27 1987-03-03 Oxley Robert Frederick Tuning screw having a resilient plastics bush which supports the tuning plunger within a metal bush
US4553334A (en) 1984-02-03 1985-11-19 Westinghouse Electric Corp. Universal dowel pin system
DE4231339A1 (de) 1992-09-18 1994-03-24 Hans Kuehl Vorrichtung zum Paßzentrieren und zum Paßverbinden
EP0662200A1 (fr) 1992-09-18 1995-07-12 Hans Kuehl Dispositif pour relier au moins deux elements.
NZ244817A (en) 1992-10-20 1997-11-24 Lesa Systems Ltd Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement
US5568675A (en) * 1994-03-29 1996-10-29 Nifco Inc. Two-piece clip
US6345946B1 (en) * 2000-08-03 2002-02-12 Radio Systems Corporation Fastener
US20040020016A1 (en) * 2002-06-12 2004-02-05 Piolax, Inc. Two-piece clip
ES2273210T3 (es) 2003-02-07 2007-05-01 Friatec Aktiengesellschaft Elemento de recepcion.
EP1529966A1 (fr) 2003-11-07 2005-05-11 Modular Systems, Inc. Cheville de fixation et joints comprenants celle-ci
EP1548297A1 (fr) 2003-12-23 2005-06-29 Spirol International Corporation Goupille avec rainures de forme spirale
US20060088396A1 (en) * 2004-10-21 2006-04-27 Thom Ray A ADA compliant element
US20090274533A1 (en) * 2006-10-19 2009-11-05 Gunther Zimmer Cover plate anchor with cover plate engagement structure
US7794273B2 (en) * 2007-11-16 2010-09-14 Hon Hai Precision Ind. Co., Ltd. Cable connector assembly with improved fastening device
CN202348887U (zh) 2011-11-21 2012-07-25 刘美福 一种多功能定位销
US20180156255A1 (en) * 2015-01-26 2018-06-07 Good Earth Lighting, Inc. Anchor fastener
US20210033132A1 (en) * 2019-07-31 2021-02-04 Radian Thermal Products, Inc. Locking push pin

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Written Opinion of the International Searching Authority dated May 25, 2020 from IA PCT/DK2020/050061.

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WO2020192853A1 (fr) 2020-10-01
US20220090617A1 (en) 2022-03-24
EP3947986A1 (fr) 2022-02-09

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